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linited @States @aient @titille Leners Patent No. 94,396, daad August31, 1869.

The Schedule referred to in these Letters Patent and making part of thesame To all whom. if may concern:

Be it known that I, CHARLES W. CAHOON, of YPortland, in the'county ofCumberland, and State of Maine, have invented a new and usefulImprovement in Locomotives; and I hereby declare the following to be afull, clear, and exact description thereof', which will enable others tomake and use my invention, reference being had to the accompanyingdrawings, forming part of this speciiication, in which- Figure 1 is atop plan of the running-gear and engines.

Figure 2 is a side elevation of boiler and engines, and a sectionalelevation of the running-gear.

My invention consists- First, in an improved device for facilitating thepropulsion of cars, &c., and

Second, in anjmproved method of communicating motion to thedriving-wheels.

In the operation of Streetcar locomotives, where steep grades arefrequently encountered, it is of great import-ance that a large amountof tractive power should beV ready at' hand to be brought into use whenneeded, and for this purpose, I have attached to the locomotive anadjustable friction driving-Wheel.

It is also desirablein street-locomotives, and especially in thelocomotive patcntedby me, November 5, 1867, that they may be capable ofbeingloperated with a low pressure of steam, and at the same time nothaye inconveniently large engines, and also that the engines may beplaced perpendioularly, or nearly so, at one end of the locomotive, whenthe crank-shait foroperating the driving-wheels is at the other end; andto obtain this result, I place a vibratable arm in the connecting-rodbetween the engine and the crankshaft'of the driving-wheels, so as tochange the line of motion of the connecting-rod, and also to obtainleverage thereby.

The locomotive presented in the drawing is of that yclass patented byine, November 5, 1867, and is intended to be operated without fire uponthe same,

the water for making the steam being heated at a stationary boiler, andtransferred therefrom to the locomotive.

A represents the hot-water tank.

B, the frame-work of the platform on which rests the tank, engines, 85o.

C is the crank-shaft which operates theernain driving-Wheels D D, andlikewise the adjustable friction driving-wheels E E.

These wheels E are set in a vibratable frame, I", which is pivoted tothe crank-shaft C.- They are .madeot vulcanized rubber, and are intendedto act' 'upon the track between the rails, being operated by agear-wheel, 1, attached to their shaft, and connecting with agear-wheel, 2, on the crank-shaft.v

b' b' represent spurs in the periphery, which are held therein by atransverse rod, put through the side and vthrough the inner part of thespur, within the wheel.

These spurs may or may not be used, depending upon the weight of thelocomotive and the load tobe haul'ed.

G is a screw passing through a loose nut in a crossbar in the bottomframe B, with the lower end jointed loosely in .the frame F. The upperend has a handle attached at a convenient height to be easily operated.

The wheels E E are brought into action by simply turning down the screwG until they come in contact with the ground. Turning it up, of coursetakes them out of action.'

H is the vihratable arm in the connecting-rod, and is pivoted to across-bar in the frame B, the connecting-rod, in its verticalaction,being attached to one side of this arm, at a, and in its horizontalaction to the other side, at b, the side a being' the longest, sol as toproduce leverage upon the driving-wheels.

3 is a gear-wheel on the shaft of the driving-wheels D D, and isconnected with the gear-wheel 2 on the f crank-shaft.

e is the engine.

d, the valve-rod.

c, a tank in front of the engine, to receive the exhaust steam, and tolet it oit' gradually, to prevent noise. l

f f, pipes for letting oii the condensed water from the engines, whichpipes also lead into the tank c'.

g is a pipe to let oi" the condensed water. n

It is the exhaust-pipe.

,'a pipe to carry steam from the reservoir-tank to the engines.

j is a pipe to let oii' steam and air while iilling the reservoir withhot water from the stationary boiler.

k, the lling-pipe.

Z, the discharging-pipe.

The driving-wheels D I) are constructed with cushioned, orpartly-elastic peripheries, in accordance with a prior application forpatent by me. p

The brakes, when the wheels are thus constructed, may be made to operateupon the sides of the wheels, instead of upon their peripheries, asusual.V

WVhat I claim as my invention, and desire to secure by Letters Patent,is-

1. The adjustable friction driving-wheels connected -to the locomotive,as set forth, and capable of an intermittent or continuous operation,.asherein described.

2. The cylinder c'. bellcrank a, and connecting-rods with .crank-shaftC, driving-wheels D, and supplementary adjustable driving-wheels E E,when constructed and arranged as described.

CHARLES W. CAHOON. Witnesses:

WILLIAM H. CLIFFORD, HENRY C. HOUSTON.

